yrs ago, i broke the center brace of my 55gallon All-glass tank, i contacted my local fish store, that carried all-glass exclusively, and i talked to them, and they special ordered my the top plastic frame, with the center brace for ~17bucks.
i suggest you try looking for a local fish store that stocks just the brand tank you have. and asking them for help, most can special order those molding peices.
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